数据可视化(1)--Chart.js
Chart.js是一个HTML5图表库，使用canvas元素来展示各式各样的客户端图表，支持折线图、柱形图、雷达图、饼图、环形图等。在每种图表中，还包含了大量的自定义选项，包括动画展示形式。 Chart.js比较轻量（gzip版本仅4.5k），且不依赖其他库。
曲线图（Line chart）
<!doctype html>
<html>
<head>
<title>Line Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
canvas{
}
</style>
</head>
<body>
<canvas id="canvas" height="450" width="600"></canvas> <script> var lineChartData = {
// x轴的标示
labels : ["January","February","March","April","May","June","July"],
// 数据，数组中的每一个object代表一条线
datasets : [
{
// 颜色的使用类似于CSS，你也可以使用RGB、HEX或者HSL
// rgba颜色中最后一个值代表透明度
// 填充颜色
fillColor : "rgba(220,220,220,0.5)",
// 线的颜色
strokeColor : "rgba(220,220,220,1)",
// 点的填充颜色
pointColor : "rgba(220,220,220,1)",
// 点的边线颜色
pointStrokeColor : "#fff",
// 与x轴标示对应的数据
data : [65,59,90,81,56,55,40]
},
{
fillColor : "rgba(151,187,205,0)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
data : [28,48,40,19,96,27,100]
}
] } var myLine = new Chart(document.getElementById("canvas").getContext("2d")).Line(lineChartData); </script>
</body>
</html>
效果如下
图表选项
var options = {
//Boolean - If we show the scale above the chart data
// 网格线是否在数据线的上面
scaleOverlay : false,
//Boolean - If we want to override with a hard coded scale
// 是否用硬编码重写y轴网格线
scaleOverride : false,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
// y轴刻度的个数
scaleSteps : null,
//Number - The value jump in the hard coded scale
// y轴每个刻度的宽度
scaleStepWidth : null,
//Number - The scale starting value
// y轴的起始值
scaleStartValue : null,
//String - Colour of the scale line
// x轴y轴的颜色
scaleLineColor : "rgba(0,0,0,1)",
//Number - Pixel width of the scale line
// x轴y轴的线宽
scaleLineWidth : 1,
//Boolean - Whether to show labels on the scale
// 是否显示y轴的标签
scaleShowLabels : true,
//Interpolated JS string - can access value
// 标签显示值
scaleLabel : "<%=value%>",
//String - Scale label font declaration for the scale label
// 标签的字体
scaleFontFamily : "'Arial'",
//Number - Scale label font size in pixels
// 标签字体的大小
scaleFontSize : 12,
//String - Scale label font weight style
// 标签字体的样式
scaleFontStyle : "normal",
//String - Scale label font colour
// 标签字体的颜色
scaleFontColor : "#666",
///Boolean - Whether grid lines are shown across the chart
// 是否显示网格线
scaleShowGridLines : true,
//String - Colour of the grid lines
// 网格线的颜色
scaleGridLineColor : "rgba(0,0,0,.1)",
//Number - Width of the grid lines
// 网格线的线宽
scaleGridLineWidth : 1,
//Boolean - Whether the line is curved between points
// 是否是曲线
bezierCurve : true,
//Boolean - Whether to show a dot for each point
// 是否显示点
pointDot : true,
//Number - Radius of each point dot in pixels
// 点的半径
pointDotRadius : 3,
//Number - Pixel width of point dot stroke
// 点的线宽
pointDotStrokeWidth : 1,
//Boolean - Whether to show a stroke for datasets
datasetStroke : true,
//Number - Pixel width of dataset stroke
// 数据线的线宽
datasetStrokeWidth : 3,
//Boolean - Whether to fill the dataset with a colour
// 数据线是否填充颜色
datasetFill : true,
//Boolean - Whether to animate the chart
// 是否有动画效果
animation : true,
//Number - Number of animation steps
// 动画的步数
animationSteps : 60,
//String - Animation easing effect
// 动画的效果
animationEasing : "easeOutQuart",
//Function - Fires when the animation is complete
// 动画完成后调用
onAnimationComplete : null
}
添加选项后，调用如下
var myLine = new Chart(document.getElementById("canvas").getContext("2d")).Line(lineChartData, options);
柱状图（Bar chart）
<!doctype html>
<html>
<head>
<title>Bar Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
canvas{
}
</style>
</head>
<body>
<canvas id="canvas" height="450" width="600"></canvas> <script> var barChartData = {
labels : ["January","February","March","April","May","June","July"],
datasets : [
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
data : [65,59,90,81,56,55,40]
},
{
fillColor : "rgba(151,187,205,0.5)",
strokeColor : "rgba(151,187,205,1)",
data : [28,48,40,19,96,27,100]
}
] } var myLine = new Chart(document.getElementById("canvas").getContext("2d")).Bar(barChartData); </script>
</body>
</html>
效果如下
图表选项，内容基本如上，不一一注释
Bar.defaults = {
//Boolean - If we show the scale above the chart data
scaleOverlay : false,
//Boolean - If we want to override with a hard coded scale
scaleOverride : false,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : null,
//Number - The value jump in the hard coded scale
scaleStepWidth : null,
//Number - The scale starting value
scaleStartValue : null,
//String - Colour of the scale line
scaleLineColor : "rgba(0,0,0,.1)",
//Number - Pixel width of the scale line
scaleLineWidth : 1,
//Boolean - Whether to show labels on the scale
scaleShowLabels : false,
//Interpolated JS string - can access value
scaleLabel : "<%=value%>",
//String - Scale label font declaration for the scale label
scaleFontFamily : "'Arial'",
//Number - Scale label font size in pixels
scaleFontSize : 12,
//String - Scale label font weight style
scaleFontStyle : "normal",
//String - Scale label font colour
scaleFontColor : "#666",
///Boolean - Whether grid lines are shown across the chart
scaleShowGridLines : true,
//String - Colour of the grid lines
scaleGridLineColor : "rgba(0,0,0,.05)",
//Number - Width of the grid lines
scaleGridLineWidth : 1,
//Boolean - If there is a stroke on each bar
barShowStroke : true,
//Number - Pixel width of the bar stroke
barStrokeWidth : 2,
//Number - Spacing between each of the X value sets
// 柱状块与x值所形成的线（如：x=20这条线）之间的距离
barValueSpacing : 5,
//Number - Spacing between data sets within X values
// 在同一x值内的柱状块之间的间距
barDatasetSpacing : 1,
//Boolean - Whether to animate the chart
animation : true,
//Number - Number of animation steps
animationSteps : 60,
//String - Animation easing effect
animationEasing : "easeOutQuart",
//Function - Fires when the animation is complete
onAnimationComplete : null
}
雷达图或蛛网图（Radar chart）
<!doctype html>
<html>
<head>
<title>Radar Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
canvas{
}
</style>
</head>
<body>
<canvas id="canvas" height="450" width="450"></canvas> <script> var radarChartData = {
labels : ["Eating","Drinking","Sleeping","Designing","Coding","Partying","Running"],
datasets : [
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
data : [65,59,90,81,56,55,40]
},
{
fillColor : "rgba(151,187,205,0.5)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
data : [28,48,40,19,96,27,100]
}
] } var myRadar = new Chart(document.getElementById("canvas").getContext("2d")).Radar(radarChartData,{scaleShowLabels : false, pointLabelFontSize : 10}); </script>
</body>
</html>
效果如下
图表选项，内容基本如上，不一一注释
Radar.defaults = {
//Boolean - If we show the scale above the chart data
scaleOverlay : false,
//Boolean - If we want to override with a hard coded scale
scaleOverride : false,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : null,
//Number - The value jump in the hard coded scale
scaleStepWidth : null,
//Number - The centre starting value
scaleStartValue : null,
//Boolean - Whether to show lines for each scale point
scaleShowLine : true,
//String - Colour of the scale line
scaleLineColor : "rgba(0,0,0,.1)",
//Number - Pixel width of the scale line
scaleLineWidth : 1,
//Boolean - Whether to show labels on the scale
scaleShowLabels : false,
//Interpolated JS string - can access value
scaleLabel : "<%=value%>",
//String - Scale label font declaration for the scale label
scaleFontFamily : "'Arial'",
//Number - Scale label font size in pixels
scaleFontSize : 12,
//String - Scale label font weight style
scaleFontStyle : "normal",
//String - Scale label font colour
scaleFontColor : "#666",
//Boolean - Show a backdrop to the scale label
scaleShowLabelBackdrop : true,
//String - The colour of the label backdrop
scaleBackdropColor : "rgba(255,255,255,0.75)",
//Number - The backdrop padding above & below the label in pixels
scaleBackdropPaddingY : 2,
//Number - The backdrop padding to the side of the label in pixels
scaleBackdropPaddingX : 2,
//Boolean - Whether we show the angle lines out of the radar
// 是否显示角度线
angleShowLineOut : true,
//String - Colour of the angle line
// 角度线的颜色
angleLineColor : "rgba(0,0,0,.1)",
//Number - Pixel width of the angle line
// 角度线的线宽
angleLineWidth : 1,
//String - Point label font declaration
pointLabelFontFamily : "'Arial'",
//String - Point label font weight
pointLabelFontStyle : "normal",
//Number - Point label font size in pixels
pointLabelFontSize : 12,
//String - Point label font colour
pointLabelFontColor : "#666",
//Boolean - Whether to show a dot for each point
pointDot : true,
//Number - Radius of each point dot in pixels
pointDotRadius : 3,
//Number - Pixel width of point dot stroke
pointDotStrokeWidth : 1,
//Boolean - Whether to show a stroke for datasets
datasetStroke : true,
//Number - Pixel width of dataset stroke
datasetStrokeWidth : 2,
//Boolean - Whether to fill the dataset with a colour
datasetFill : true,
//Boolean - Whether to animate the chart
animation : true,
//Number - Number of animation steps
animationSteps : 60,
//String - Animation easing effect
animationEasing : "easeOutQuart",
//Function - Fires when the animation is complete
onAnimationComplete : null
}
极地区域图（Polar area chart）
<!doctype html>
<html>
<head>
<title>Polar Area Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
</style>
</head>
<body>
<canvas id="canvas" height="400" width="400"></canvas> <script>
var chartData = [
{
value : Math.random(),
color: "#D97041"
},
{
value : Math.random(),
color: "#C7604C"
},
{
value : Math.random(),
color: "#21323D"
},
{
value : Math.random(),
color: "#9D9B7F"
},
{
value : Math.random(),
color: "#7D4F6D"
},
{
value : Math.random(),
color: "#584A5E"
}
];
var myPolarArea = new Chart(document.getElementById("canvas").getContext("2d")).PolarArea(chartData);
</script>
</body>
</html>
效果如下
图表选项
PolarArea.defaults = {
//Boolean - Whether we show the scale above or below the chart segments
scaleOverlay : true,
//Boolean - If we want to override with a hard coded scale
scaleOverride : false,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : null,
//Number - The value jump in the hard coded scale
scaleStepWidth : null,
//Number - The centre starting value
scaleStartValue : null,
//Boolean - Show line for each value in the scale
scaleShowLine : true,
//String - The colour of the scale line
scaleLineColor : "rgba(0,0,0,.1)",
//Number - The width of the line - in pixels
scaleLineWidth : 1,
//Boolean - whether we should show text labels
scaleShowLabels : true,
//Interpolated JS string - can access value
scaleLabel : "<%=value%>",
//String - Scale label font declaration for the scale label
scaleFontFamily : "'Arial'",
//Number - Scale label font size in pixels
scaleFontSize : 12,
//String - Scale label font weight style
scaleFontStyle : "normal",
//String - Scale label font colour
scaleFontColor : "#666",
//Boolean - Show a backdrop to the scale label
scaleShowLabelBackdrop : true,
//String - The colour of the label backdrop
scaleBackdropColor : "rgba(255,255,255,0.75)",
//Number - The backdrop padding above & below the label in pixels
scaleBackdropPaddingY : 2,
//Number - The backdrop padding to the side of the label in pixels
scaleBackdropPaddingX : 2,
//Boolean - Stroke a line around each segment in the chart
segmentShowStroke : true,
//String - The colour of the stroke on each segement.
segmentStrokeColor : "#fff",
//Number - The width of the stroke value in pixels
segmentStrokeWidth : 2,
//Boolean - Whether to animate the chart or not
animation : true,
//Number - Amount of animation steps
animationSteps : 100,
//String - Animation easing effect.
animationEasing : "easeOutBounce",
//Boolean - Whether to animate the rotation of the chart
animateRotate : true,
//Boolean - Whether to animate scaling the chart from the centre
animateScale : false,
//Function - This will fire when the animation of the chart is complete.
onAnimationComplete : null
}
饼图（Pie chart）
<!doctype html>
<html>
<head>
<title>Radar Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
canvas{
}
</style>
</head>
<body>
<canvas id="canvas" height="450" width="450"></canvas> <script> var pieData = [
{
value: 30,
color:"#F38630"
},
{
value : 50,
color : "#E0E4CC"
},
{
value : 100,
color : "#69D2E7"
} ]; var myPie = new Chart(document.getElementById("canvas").getContext("2d")).Pie(pieData); </script>
</body>
</html>
效果如下
图表选项
Pie.defaults = {
//Boolean - Whether we should show a stroke on each segment
// 块和块之间是否有间距
segmentShowStroke : true,
//String - The colour of each segment stroke
// 块和块之间间距的颜色
segmentStrokeColor : "#fff",
//Number - The width of each segment stroke
// 块和块之间间距的宽度
segmentStrokeWidth : 2,
//Boolean - Whether we should animate the chart
animation : true,
//Number - Amount of animation steps
animationSteps : 100,
//String - Animation easing effect
animationEasing : "easeOutBounce",
//Boolean - Whether we animate the rotation of the Pie
// 是否有从0度到360度的动画
animateRotate : true,
//Boolean - Whether we animate scaling the Pie from the centre
// 是否有从中心到边缘的动画
animateScale : false,
//Function - Will fire on animation completion.
onAnimationComplete : null
}
环形图（Doughnut chart）
<!doctype html>
<html>
<head>
<title>Doughnut Chart</title>
<script src="../Chart.js"></script>
<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
<style>
canvas{
}
</style>
</head>
<body>
<canvas id="canvas" height="450" width="450"></canvas> <script> var doughnutData = [
{
value: 30,
color:"#F7464A"
},
{
value : 50,
color : "#46BFBD"
},
{
value : 100,
color : "#FDB45C"
},
{
value : 40,
color : "#949FB1"
},
{
value : 120,
color : "#4D5360"
} ]; var myDoughnut = new Chart(document.getElementById("canvas").getContext("2d")).Doughnut(doughnutData); </script>
</body>
</html>
效果如下
图标选项
Doughnut.defaults = {
//Boolean - Whether we should show a stroke on each segment
segmentShowStroke : true,
//String - The colour of each segment stroke
segmentStrokeColor : "#fff",
//Number - The width of each segment stroke
segmentStrokeWidth : 2,
//The percentage of the chart that we cut out of the middle.
percentageInnerCutout : 50,
//Boolean - Whether we should animate the chart
animation : true,
//Number - Amount of animation steps
animationSteps : 100,
//String - Animation easing effect
animationEasing : "easeOutBounce",
//Boolean - Whether we animate the rotation of the Doughnut
animateRotate : true,
//Boolean - Whether we animate scaling the Doughnut from the centre
animateScale : false,
//Function - Will fire on animation completion.
onAnimationComplete : null
}
最后发现，这篇博客基本就是从官网的文档上摘下来的，不过加上了中文注释，聊胜于无吧
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